Problems with YAML

[pietrodemarinis]

I am going crazy with this YAML code for file.ahp.
Online Yaml code verifier say that it's ok but it isn't!!!
Could you hint at where does the mistake lay?
Please!

I get error:
Error in load(db) :
numero magico errato del file di ripristino (il file potrebbe essere danneggiato) - dati non caricati
Inoltre: Warning message:
file ‘Vacation.ahp’ has magic number 'Versi'
Use of save versions prior to 2 is deprecated

MY CODE:
Version: 2.0

Alternatives: &alternatives
Training
ImpSeed
Transf
FarmOrg
Market

Goal:
name: ImproveAgriSust
decision-makers:
- p1: 1
preferences:
p1:
pairwise:
- [DEC, DEN, 2]
- [DEC, DES, 1/2]
- [DEN, DES, 2]
children:
DEC:
preferences:
-p1:
[RDI, DP, 9]
[RDI, APC, 7]
[RDI, RUAC, 0.1]
[RDI, LE, 6]
[RDI, AFS, 4]
[RDI, ACP, 2]
[RDI, ARP, 5]
[DP, APC, 0.3]
[DP, RUAC, 3]
[DP, LE, 8]
[DP, AFS, 0.4]
[DP, ACP, 7]
[DP, ARP, 0.3]
[APC, RUAC, 9]
[APC, LE, 9]
[APC, AFS, 0.1]
[APC, ACP, 4]
[APC, ARP, 0.2]
[RUAC, LE, 3]
[RUAC, AFS, 0.4]
[RUAC, ACP, 0.3]
[RUAC, ARP, 0.5]
[LE, AFS, 0.1]
[LE, ACP, 0.7]
[LE, ARP, 0.6]
[AFS, ACP, 0.5]
[AFS, ARP, 0.5]
[ACP, ARP, 0.4]
children:
RDI:
children: *alternatives
DP:
children: *alternatives
APC:
children: *alternatives
RUAC:
children: *alternatives
LE:
children: *alternatives
AFS:
children: *alternatives
ACP:
children: *alternatives
ARP:
children: *alternatives
DEN:
preferences:
-p1:
[RDI, DP, 1]
[RDI, APC, 2]
[RDI, RUAC, 0.1]
[RDI, LE, 0.1]
[RDI, AFS, 0.13]
[RDI, ACP, 1]
[RDI, ARP, 2]
[DP, APC, 5]
[DP, RUAC, 0.9]
[DP, LE, 0.9]
[DP, AFS, 2]
[DP, ACP, 6]
[DP, ARP, 6]
[APC, RUAC, 0.1]
[APC, LE, 0.11]
[APC, AFS, 0.13]
[APC, ACP, 2]
[APC, ARP, 1]
[RUAC, LE, 2]
[RUAC, AFS, 2]
[RUAC, ACP, 9]
[RUAC, ARP, 9]
[LE, AFS, 2]
[LE, ACP, 9]
[LE, ARP, 9]
[AFS, ACP, 9]
[AFS, ARP, 9]
[ACP, ARP, 1]
children:
RDI:
children: *alternatives
DP:
children: *alternatives
APC:
children: *alternatives
RUAC:
children: *alternatives
LE:
children: *alternatives
AFS:
children: *alternatives
ACP:
children: *alternatives
ARP:
children: *alternatives
DES:
preferences:
-p1:
[RDI, DP, 3]
[RDI, APC, 4]
[RDI, RUAC, 3]
[RDI, LE, 2]
[RDI, AFS, 2]
[RDI, ACP, 3]
[RDI, ARP, 2]
[DP, APC, 1]
[DP, RUAC, 2]
[DP, LE, 1]
[DP, AFS, 1]
[DP, ACP, 1]
[DP, ARP, 0.13]
[APC, RUAC, 2]
[APC, LE, 2]
[APC, AFS, 1]
[APC, ACP, 1]
[APC, ARP, 0.5]
[RUAC, LE, 0.5]
[RUAC, AFS, 0.33]
[RUAC, ACP, 1]
[RUAC, ARP, 0.5]
[LE, AFS, 1]
[LE, ACP, 2]
[LE, ARP, 1]
[AFS, ACP, 2]
[AFS, ARP, 1]
[ACP, ARP, 1]
children:
RDI:
children: *alternatives
DP:
children: *alternatives
APC:
children: *alternatives
RUAC:
children: *alternatives
LE:
children: *alternatives
AFS:
children: *alternatives
ACP:
children: *alternatives
ARP:
children: *alternatives